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HK: Fachverband Hadronen und Kerne

HK 52: Accelerators and Instrumentation I

HK 52.6: Vortrag

Mittwoch, 18. März 2009, 15:30–15:45, H-ZO 80

Calibration of the Straw-Tube-Tracker for COSY-TOF — •Pierre Voigtländer, James Ritman, Matthias Röder, and Peter Wintz — Institut für Kernphysik I, Forschungzentrum Jülich GmbH, 52425 Jülich, Germany

The Straw-Tube-Tracker (STT) is a new detector for the time of flight spectrometer COSY-TOF with 3120 single straw tubes arranged in 15 double-layers. The straw tubes are filled with a gas mixture of Ar/CO₂ (90%/10%) at an absolute pressure of 1.2 bar. During a commissioning beam time in August 2008 we used a 3.1 GeV/c proton beam on a proton target to study the p p → p p and p p → d π⁺ reactions for calibration of the STT detector. In a first step the isochrone-time-relation was determined by the drift time spectra of the single straws. Using this information the trajectories of reaction particles were reconstructed and the position of the individual straw tubes was determined by iterative fitting. The calibration results were compared with simulations of single straws, using the Garfield package. The obtained spatial resolution and efficiency of the STT will be presented.
Supported in part by BMBF and FZ-Jülich.